A METHOD FOR TREATING WASTE MATERIAL WHICH INCLUDES METAL AND/OR METAL OXIDE, ORGANIC MATERIAL AND POSSIBLY ALSO WATER; AND APPARATUS FOR CARRYING OUT THE METHOD

摘要

There is disclosed a method for treating waste material containing metal and/or metal oxide, organic material and optionally also water, for the purpose of separating the organic material and any water present in vapour form. The waste material is heated indirectly while continuously advancing the waste material through a screw housing (12, 13) by means of a screw, the heat being supplied in a quantity such that the volatile constituents of the waste material are converted to gas and/or vapour form. The resultant gases and vapours are used as fuel for heating the waste material in the screw housing. The screw housing (12, 13) is only partially filled with material being treated, so as to form a vacant space in which the generated gases and/or vapours collect. The generated gases and/or vapours are discharged from the screw housing without contacting the material being treated and/or the material to be treated, and are supplied, optionally after partial condensation of gas and/or vapour originating from the organic material, to a combustion chamber (48) for generating combustion gases, which are used to indirectly heat the material in the screw housing.